drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_COMPONENT          0x04000000
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int act;
  79 module_param(act, int, 0644);
  80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  81
  82 static int crt;
  83 module_param(crt, int, 0644);
  84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  85
  86 static int tzp;
  87 module_param(tzp, int, 0444);
  88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  89
  90 static int nocrt;
  91 module_param(nocrt, int, 0);
  92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  93
  94 static int off;
  95 module_param(off, int, 0);
  96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  97
  98 static int psv;
  99 module_param(psv, int, 0644);
 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 101
 102 static int acpi_thermal_add(struct acpi_device *device);
 103 static int acpi_thermal_remove(struct acpi_device *device, int type);
 104 static int acpi_thermal_resume(struct acpi_device *device);
 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 110                                                const char __user *, size_t,
 111                                                loff_t *);
 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 114                                           size_t, loff_t *);
 115
 116 static const struct acpi_device_id  thermal_device_ids[] = {
 117         {ACPI_THERMAL_HID, 0},
 118         {"", 0},
 119 };
 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 121
 122 static struct acpi_driver acpi_thermal_driver = {
 123         .name = "thermal",
 124         .class = ACPI_THERMAL_CLASS,
 125         .ids = thermal_device_ids,
 126         .ops = {
 127                 .add = acpi_thermal_add,
 128                 .remove = acpi_thermal_remove,
 129                 .resume = acpi_thermal_resume,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct timer_list timer;
 198 };
 199
 200 static const struct file_operations acpi_thermal_state_fops = {
 201         .open = acpi_thermal_state_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static const struct file_operations acpi_thermal_temp_fops = {
 208         .open = acpi_thermal_temp_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static const struct file_operations acpi_thermal_trip_fops = {
 215         .open = acpi_thermal_trip_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static const struct file_operations acpi_thermal_cooling_fops = {
 222         .open = acpi_thermal_cooling_open_fs,
 223         .read = seq_read,
 224         .write = acpi_thermal_write_cooling_mode,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 static const struct file_operations acpi_thermal_polling_fops = {
 230         .open = acpi_thermal_polling_open_fs,
 231         .read = seq_read,
 232         .write = acpi_thermal_write_polling,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* --------------------------------------------------------------------------
 238                              Thermal Zone Management
 239    -------------------------------------------------------------------------- */
 240
 241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         tz->last_temperature = tz->temperature;
 250
 251         status =
 252             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 253         if (ACPI_FAILURE(status))
 254                 return -ENODEV;
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 257                           tz->temperature));
 258
 259         return 0;
 260 }
 261
 262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 263 {
 264         acpi_status status = AE_OK;
 265
 266
 267         if (!tz)
 268                 return -EINVAL;
 269
 270         status =
 271             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 272                                   &tz->polling_frequency);
 273         if (ACPI_FAILURE(status))
 274                 return -ENODEV;
 275
 276         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 277                           tz->polling_frequency));
 278
 279         return 0;
 280 }
 281
 282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 283 {
 284
 285         if (!tz)
 286                 return -EINVAL;
 287
 288         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 289
 290         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 291                           "Polling frequency set to %lu seconds\n",
 292                           tz->polling_frequency/10));
 293
 294         return 0;
 295 }
 296
 297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 298 {
 299         acpi_status status = AE_OK;
 300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 301         struct acpi_object_list arg_list = { 1, &arg0 };
 302         acpi_handle handle = NULL;
 303
 304
 305         if (!tz)
 306                 return -EINVAL;
 307
 308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 309         if (ACPI_FAILURE(status)) {
 310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 311                 return -ENODEV;
 312         }
 313
 314         arg0.integer.value = mode;
 315
 316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 317         if (ACPI_FAILURE(status))
 318                 return -ENODEV;
 319
 320         return 0;
 321 }
 322
 323 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 324 {
 325         acpi_status status = AE_OK;
 326         int i = 0;
 327
 328
 329         if (!tz)
 330                 return -EINVAL;
 331
 332         /* Critical Shutdown (required) */
 333
 334         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 335                                        &tz->trips.critical.temperature);
 336         if (ACPI_FAILURE(status)) {
 337                 tz->trips.critical.flags.valid = 0;
 338                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 339                 return -ENODEV;
 340         } else {
 341                 tz->trips.critical.flags.valid = 1;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 343                                   "Found critical threshold [%lu]\n",
 344                                   tz->trips.critical.temperature));
 345         }
 346
 347         if (tz->trips.critical.flags.valid == 1) {
 348                 if (crt == -1) {
 349                         tz->trips.critical.flags.valid = 0;
 350                 } else if (crt > 0) {
 351                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 352
 353                         /*
 354                          * Allow override to lower critical threshold
 355                          */
 356                         if (crt_k < tz->trips.critical.temperature)
 357                                 tz->trips.critical.temperature = crt_k;
 358                 }
 359         }
 360
 361         /* Critical Sleep (optional) */
 362
 363         status =
 364             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 365                                   &tz->trips.hot.temperature);
 366         if (ACPI_FAILURE(status)) {
 367                 tz->trips.hot.flags.valid = 0;
 368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 369         } else {
 370                 tz->trips.hot.flags.valid = 1;
 371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 372                                   tz->trips.hot.temperature));
 373         }
 374
 375         /* Passive: Processors (optional) */
 376
 377         if (psv == -1) {
 378                 status = AE_SUPPORT;
 379         } else if (psv > 0) {
 380                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 381                 status = AE_OK;
 382         } else {
 383                 status = acpi_evaluate_integer(tz->device->handle,
 384                         "_PSV", NULL, &tz->trips.passive.temperature);
 385         }
 386
 387         if (ACPI_FAILURE(status)) {
 388                 tz->trips.passive.flags.valid = 0;
 389                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 390         } else {
 391                 tz->trips.passive.flags.valid = 1;
 392
 393                 status =
 394                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 395                                           &tz->trips.passive.tc1);
 396                 if (ACPI_FAILURE(status))
 397                         tz->trips.passive.flags.valid = 0;
 398
 399                 status =
 400                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 401                                           &tz->trips.passive.tc2);
 402                 if (ACPI_FAILURE(status))
 403                         tz->trips.passive.flags.valid = 0;
 404
 405                 status =
 406                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 407                                           &tz->trips.passive.tsp);
 408                 if (ACPI_FAILURE(status))
 409                         tz->trips.passive.flags.valid = 0;
 410
 411                 status =
 412                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 413                                             &tz->trips.passive.devices);
 414                 if (ACPI_FAILURE(status))
 415                         tz->trips.passive.flags.valid = 0;
 416
 417                 if (!tz->trips.passive.flags.valid)
 418                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 419                 else
 420                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 421                                           "Found passive threshold [%lu]\n",
 422                                           tz->trips.passive.temperature));
 423         }
 424
 425         /* Active: Fans, etc. (optional) */
 426
 427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 428
 429                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 430
 431                 if (act == -1)
 432                         break;  /* disable all active trip points */
 433
 434                 status = acpi_evaluate_integer(tz->device->handle,
 435                         name, NULL, &tz->trips.active[i].temperature);
 436
 437                 if (ACPI_FAILURE(status)) {
 438                         if (i == 0)     /* no active trip points */
 439                                 break;
 440                         if (act <= 0)   /* no override requested */
 441                                 break;
 442                         if (i == 1) {   /* 1 trip point */
 443                                 tz->trips.active[0].temperature =
 444                                         CELSIUS_TO_KELVIN(act);
 445                         } else {        /* multiple trips */
 446                                 /*
 447                                  * Don't allow override higher than
 448                                  * the next higher trip point
 449                                  */
 450                                 tz->trips.active[i - 1].temperature =
 451                                     (tz->trips.active[i - 2].temperature <
 452                                         CELSIUS_TO_KELVIN(act) ?
 453                                         tz->trips.active[i - 2].temperature :
 454                                         CELSIUS_TO_KELVIN(act));
 455                         }
 456                         break;
 457                 }
 458
 459                 name[2] = 'L';
 460                 status =
 461                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 462                                             &tz->trips.active[i].devices);
 463                 if (ACPI_SUCCESS(status)) {
 464                         tz->trips.active[i].flags.valid = 1;
 465                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 466                                           "Found active threshold [%d]:[%lu]\n",
 467                                           i, tz->trips.active[i].temperature));
 468                 } else
 469                         ACPI_EXCEPTION((AE_INFO, status,
 470                                         "Invalid active threshold [%d]", i));
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 477 {
 478         acpi_status status = AE_OK;
 479
 480
 481         if (!tz)
 482                 return -EINVAL;
 483
 484         status =
 485             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 486         if (ACPI_FAILURE(status))
 487                 return -ENODEV;
 488
 489         return 0;
 490 }
 491
 492 static int acpi_thermal_critical(struct acpi_thermal *tz)
 493 {
 494         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 495                 return -EINVAL;
 496
 497         if (tz->temperature >= tz->trips.critical.temperature) {
 498                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 499                 tz->trips.critical.flags.enabled = 1;
 500         } else if (tz->trips.critical.flags.enabled)
 501                 tz->trips.critical.flags.enabled = 0;
 502
 503         printk(KERN_EMERG
 504                "Critical temperature reached (%ld C), shutting down.\n",
 505                KELVIN_TO_CELSIUS(tz->temperature));
 506         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 507                                 tz->trips.critical.flags.enabled);
 508         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 509                                           tz->device->dev.bus_id,
 510                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 511                                           tz->trips.critical.flags.enabled);
 512
 513         orderly_poweroff(true);
 514
 515         return 0;
 516 }
 517
 518 static int acpi_thermal_hot(struct acpi_thermal *tz)
 519 {
 520         if (!tz || !tz->trips.hot.flags.valid || nocrt)
 521                 return -EINVAL;
 522
 523         if (tz->temperature >= tz->trips.hot.temperature) {
 524                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 525                 tz->trips.hot.flags.enabled = 1;
 526         } else if (tz->trips.hot.flags.enabled)
 527                 tz->trips.hot.flags.enabled = 0;
 528
 529         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 530                                 tz->trips.hot.flags.enabled);
 531         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 532                                           tz->device->dev.bus_id,
 533                                           ACPI_THERMAL_NOTIFY_HOT,
 534                                           tz->trips.hot.flags.enabled);
 535
 536         /* TBD: Call user-mode "sleep(S4)" function */
 537
 538         return 0;
 539 }
 540
 541 static void acpi_thermal_passive(struct acpi_thermal *tz)
 542 {
 543         int result = 1;
 544         struct acpi_thermal_passive *passive = NULL;
 545         int trend = 0;
 546         int i = 0;
 547
 548
 549         if (!tz || !tz->trips.passive.flags.valid)
 550                 return;
 551
 552         passive = &(tz->trips.passive);
 553
 554         /*
 555          * Above Trip?
 556          * -----------
 557          * Calculate the thermal trend (using the passive cooling equation)
 558          * and modify the performance limit for all passive cooling devices
 559          * accordingly.  Note that we assume symmetry.
 560          */
 561         if (tz->temperature >= passive->temperature) {
 562                 trend =
 563                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 564                     (passive->tc2 * (tz->temperature - passive->temperature));
 565                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 566                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 567                                   trend, passive->tc1, tz->temperature,
 568                                   tz->last_temperature, passive->tc2,
 569                                   tz->temperature, passive->temperature));
 570                 passive->flags.enabled = 1;
 571                 /* Heating up? */
 572                 if (trend > 0)
 573                         for (i = 0; i < passive->devices.count; i++)
 574                                 acpi_processor_set_thermal_limit(passive->
 575                                                                  devices.
 576                                                                  handles[i],
 577                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 578                 /* Cooling off? */
 579                 else if (trend < 0) {
 580                         for (i = 0; i < passive->devices.count; i++)
 581                                 /*
 582                                  * assume that we are on highest
 583                                  * freq/lowest thrott and can leave
 584                                  * passive mode, even in error case
 585                                  */
 586                                 if (!acpi_processor_set_thermal_limit
 587                                     (passive->devices.handles[i],
 588                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 589                                         result = 0;
 590                         /*
 591                          * Leave cooling mode, even if the temp might
 592                          * higher than trip point This is because some
 593                          * machines might have long thermal polling
 594                          * frequencies (tsp) defined. We will fall back
 595                          * into passive mode in next cycle (probably quicker)
 596                          */
 597                         if (result) {
 598                                 passive->flags.enabled = 0;
 599                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 600                                                   "Disabling passive cooling, still above threshold,"
 601                                                   " but we are cooling down\n"));
 602                         }
 603                 }
 604                 return;
 605         }
 606
 607         /*
 608          * Below Trip?
 609          * -----------
 610          * Implement passive cooling hysteresis to slowly increase performance
 611          * and avoid thrashing around the passive trip point.  Note that we
 612          * assume symmetry.
 613          */
 614         if (!passive->flags.enabled)
 615                 return;
 616         for (i = 0; i < passive->devices.count; i++)
 617                 if (!acpi_processor_set_thermal_limit
 618                     (passive->devices.handles[i],
 619                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 620                         result = 0;
 621         if (result) {
 622                 passive->flags.enabled = 0;
 623                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 624                                   "Disabling passive cooling (zone is cool)\n"));
 625         }
 626 }
 627
 628 static void acpi_thermal_active(struct acpi_thermal *tz)
 629 {
 630         int result = 0;
 631         struct acpi_thermal_active *active = NULL;
 632         int i = 0;
 633         int j = 0;
 634         unsigned long maxtemp = 0;
 635
 636
 637         if (!tz)
 638                 return;
 639
 640         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 641                 active = &(tz->trips.active[i]);
 642                 if (!active || !active->flags.valid)
 643                         break;
 644                 if (tz->temperature >= active->temperature) {
 645                         /*
 646                          * Above Threshold?
 647                          * ----------------
 648                          * If not already enabled, turn ON all cooling devices
 649                          * associated with this active threshold.
 650                          */
 651                         if (active->temperature > maxtemp)
 652                                 tz->state.active_index = i;
 653                         maxtemp = active->temperature;
 654                         if (active->flags.enabled)
 655                                 continue;
 656                         for (j = 0; j < active->devices.count; j++) {
 657                                 result =
 658                                     acpi_bus_set_power(active->devices.
 659                                                        handles[j],
 660                                                        ACPI_STATE_D0);
 661                                 if (result) {
 662                                         printk(KERN_WARNING PREFIX
 663                                                       "Unable to turn cooling device [%p] 'on'\n",
 664                                                       active->devices.
 665                                                       handles[j]);
 666                                         continue;
 667                                 }
 668                                 active->flags.enabled = 1;
 669                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 670                                                   "Cooling device [%p] now 'on'\n",
 671                                                   active->devices.handles[j]));
 672                         }
 673                         continue;
 674                 }
 675                 if (!active->flags.enabled)
 676                         continue;
 677                 /*
 678                  * Below Threshold?
 679                  * ----------------
 680                  * Turn OFF all cooling devices associated with this
 681                  * threshold.
 682                  */
 683                 for (j = 0; j < active->devices.count; j++) {
 684                         result = acpi_bus_set_power(active->devices.handles[j],
 685                                                     ACPI_STATE_D3);
 686                         if (result) {
 687                                 printk(KERN_WARNING PREFIX
 688                                               "Unable to turn cooling device [%p] 'off'\n",
 689                                               active->devices.handles[j]);
 690                                 continue;
 691                         }
 692                         active->flags.enabled = 0;
 693                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 694                                           "Cooling device [%p] now 'off'\n",
 695                                           active->devices.handles[j]));
 696                 }
 697         }
 698 }
 699
 700 static void acpi_thermal_check(void *context);
 701
 702 static void acpi_thermal_run(unsigned long data)
 703 {
 704         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 705         if (!tz->zombie)
 706                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 707 }
 708
 709 static void acpi_thermal_check(void *data)
 710 {
 711         int result = 0;
 712         struct acpi_thermal *tz = data;
 713         unsigned long sleep_time = 0;
 714         int i = 0;
 715         struct acpi_thermal_state state;
 716
 717
 718         if (!tz) {
 719                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 720                 return;
 721         }
 722
 723         state = tz->state;
 724
 725         result = acpi_thermal_get_temperature(tz);
 726         if (result)
 727                 return;
 728
 729         memset(&tz->state, 0, sizeof(tz->state));
 730
 731         /*
 732          * Check Trip Points
 733          * -----------------
 734          * Compare the current temperature to the trip point values to see
 735          * if we've entered one of the thermal policy states.  Note that
 736          * this function determines when a state is entered, but the
 737          * individual policy decides when it is exited (e.g. hysteresis).
 738          */
 739         if (tz->trips.critical.flags.valid)
 740                 state.critical |=
 741                     (tz->temperature >= tz->trips.critical.temperature);
 742         if (tz->trips.hot.flags.valid)
 743                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 744         if (tz->trips.passive.flags.valid)
 745                 state.passive |=
 746                     (tz->temperature >= tz->trips.passive.temperature);
 747         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 748                 if (tz->trips.active[i].flags.valid)
 749                         state.active |=
 750                             (tz->temperature >=
 751                              tz->trips.active[i].temperature);
 752
 753         /*
 754          * Invoke Policy
 755          * -------------
 756          * Separated from the above check to allow individual policy to
 757          * determine when to exit a given state.
 758          */
 759         if (state.critical)
 760                 acpi_thermal_critical(tz);
 761         if (state.hot)
 762                 acpi_thermal_hot(tz);
 763         if (state.passive)
 764                 acpi_thermal_passive(tz);
 765         if (state.active)
 766                 acpi_thermal_active(tz);
 767
 768         /*
 769          * Calculate State
 770          * ---------------
 771          * Again, separated from the above two to allow independent policy
 772          * decisions.
 773          */
 774         tz->state.critical = tz->trips.critical.flags.enabled;
 775         tz->state.hot = tz->trips.hot.flags.enabled;
 776         tz->state.passive = tz->trips.passive.flags.enabled;
 777         tz->state.active = 0;
 778         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 779                 tz->state.active |= tz->trips.active[i].flags.enabled;
 780
 781         /*
 782          * Calculate Sleep Time
 783          * --------------------
 784          * If we're in the passive state, use _TSP's value.  Otherwise
 785          * use the default polling frequency (e.g. _TZP).  If no polling
 786          * frequency is specified then we'll wait forever (at least until
 787          * a thermal event occurs).  Note that _TSP and _TZD values are
 788          * given in 1/10th seconds (we must covert to milliseconds).
 789          */
 790         if (tz->state.passive)
 791                 sleep_time = tz->trips.passive.tsp * 100;
 792         else if (tz->polling_frequency > 0)
 793                 sleep_time = tz->polling_frequency * 100;
 794
 795         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 796                           tz->name, tz->temperature, sleep_time));
 797
 798         /*
 799          * Schedule Next Poll
 800          * ------------------
 801          */
 802         if (!sleep_time) {
 803                 if (timer_pending(&(tz->timer)))
 804                         del_timer(&(tz->timer));
 805         } else {
 806                 if (timer_pending(&(tz->timer)))
 807                         mod_timer(&(tz->timer),
 808                                         jiffies + (HZ * sleep_time) / 1000);
 809                 else {
 810                         tz->timer.data = (unsigned long)tz;
 811                         tz->timer.function = acpi_thermal_run;
 812                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 813                         add_timer(&(tz->timer));
 814                 }
 815         }
 816
 817         return;
 818 }
 819
 820 /* --------------------------------------------------------------------------
 821                               FS Interface (/proc)
 822    -------------------------------------------------------------------------- */
 823
 824 static struct proc_dir_entry *acpi_thermal_dir;
 825
 826 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 827 {
 828         struct acpi_thermal *tz = seq->private;
 829
 830
 831         if (!tz)
 832                 goto end;
 833
 834         seq_puts(seq, "state:                   ");
 835
 836         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 837             && !tz->state.active)
 838                 seq_puts(seq, "ok\n");
 839         else {
 840                 if (tz->state.critical)
 841                         seq_puts(seq, "critical ");
 842                 if (tz->state.hot)
 843                         seq_puts(seq, "hot ");
 844                 if (tz->state.passive)
 845                         seq_puts(seq, "passive ");
 846                 if (tz->state.active)
 847                         seq_printf(seq, "active[%d]", tz->state.active_index);
 848                 seq_puts(seq, "\n");
 849         }
 850
 851       end:
 852         return 0;
 853 }
 854
 855 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 856 {
 857         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 858 }
 859
 860 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 861 {
 862         int result = 0;
 863         struct acpi_thermal *tz = seq->private;
 864
 865
 866         if (!tz)
 867                 goto end;
 868
 869         result = acpi_thermal_get_temperature(tz);
 870         if (result)
 871                 goto end;
 872
 873         seq_printf(seq, "temperature:             %ld C\n",
 874                    KELVIN_TO_CELSIUS(tz->temperature));
 875
 876       end:
 877         return 0;
 878 }
 879
 880 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 881 {
 882         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 883 }
 884
 885 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 886 {
 887         struct acpi_thermal *tz = seq->private;
 888         struct acpi_device *device;
 889         acpi_status status;
 890
 891         int i = 0;
 892         int j = 0;
 893
 894
 895         if (!tz)
 896                 goto end;
 897
 898         if (tz->trips.critical.flags.valid)
 899                 seq_printf(seq, "critical (S5):           %ld C%s",
 900                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 901                            nocrt ? " <disabled>\n" : "\n");
 902
 903         if (tz->trips.hot.flags.valid)
 904                 seq_printf(seq, "hot (S4):                %ld C%s",
 905                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 906                            nocrt ? " <disabled>\n" : "\n");
 907
 908         if (tz->trips.passive.flags.valid) {
 909                 seq_printf(seq,
 910                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 911                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 912                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 913                            tz->trips.passive.tsp);
 914                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 915                         status = acpi_bus_get_device(tz->trips.passive.devices.
 916                                                      handles[j], &device);
 917                         seq_printf(seq, "%4.4s ", status ? "" :
 918                                    acpi_device_bid(device));
 919                 }
 920                 seq_puts(seq, "\n");
 921         }
 922
 923         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 924                 if (!(tz->trips.active[i].flags.valid))
 925                         break;
 926                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 927                            i,
 928                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 929                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 930                         status = acpi_bus_get_device(tz->trips.active[i].
 931                                                      devices.handles[j],
 932                                                      &device);
 933                         seq_printf(seq, "%4.4s ", status ? "" :
 934                                    acpi_device_bid(device));
 935                 }
 936                 seq_puts(seq, "\n");
 937         }
 938
 939       end:
 940         return 0;
 941 }
 942
 943 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 944 {
 945         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 946 }
 947
 948 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 949 {
 950         struct acpi_thermal *tz = seq->private;
 951
 952
 953         if (!tz)
 954                 goto end;
 955
 956         if (!tz->flags.cooling_mode)
 957                 seq_puts(seq, "<setting not supported>\n");
 958         else
 959                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 960
 961       end:
 962         return 0;
 963 }
 964
 965 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 966 {
 967         return single_open(file, acpi_thermal_cooling_seq_show,
 968                            PDE(inode)->data);
 969 }
 970
 971 static ssize_t
 972 acpi_thermal_write_cooling_mode(struct file *file,
 973                                 const char __user * buffer,
 974                                 size_t count, loff_t * ppos)
 975 {
 976         struct seq_file *m = file->private_data;
 977         struct acpi_thermal *tz = m->private;
 978         int result = 0;
 979         char mode_string[12] = { '\0' };
 980
 981
 982         if (!tz || (count > sizeof(mode_string) - 1))
 983                 return -EINVAL;
 984
 985         if (!tz->flags.cooling_mode)
 986                 return -ENODEV;
 987
 988         if (copy_from_user(mode_string, buffer, count))
 989                 return -EFAULT;
 990
 991         mode_string[count] = '\0';
 992
 993         result = acpi_thermal_set_cooling_mode(tz,
 994                                                simple_strtoul(mode_string, NULL,
 995                                                               0));
 996         if (result)
 997                 return result;
 998
 999         acpi_thermal_check(tz);
1000
1001         return count;
1002 }
1003
1004 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1005 {
1006         struct acpi_thermal *tz = seq->private;
1007
1008
1009         if (!tz)
1010                 goto end;
1011
1012         if (!tz->polling_frequency) {
1013                 seq_puts(seq, "<polling disabled>\n");
1014                 goto end;
1015         }
1016
1017         seq_printf(seq, "polling frequency:       %lu seconds\n",
1018                    (tz->polling_frequency / 10));
1019
1020       end:
1021         return 0;
1022 }
1023
1024 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1025 {
1026         return single_open(file, acpi_thermal_polling_seq_show,
1027                            PDE(inode)->data);
1028 }
1029
1030 static ssize_t
1031 acpi_thermal_write_polling(struct file *file,
1032                            const char __user * buffer,
1033                            size_t count, loff_t * ppos)
1034 {
1035         struct seq_file *m = file->private_data;
1036         struct acpi_thermal *tz = m->private;
1037         int result = 0;
1038         char polling_string[12] = { '\0' };
1039         int seconds = 0;
1040
1041
1042         if (!tz || (count > sizeof(polling_string) - 1))
1043                 return -EINVAL;
1044
1045         if (copy_from_user(polling_string, buffer, count))
1046                 return -EFAULT;
1047
1048         polling_string[count] = '\0';
1049
1050         seconds = simple_strtoul(polling_string, NULL, 0);
1051
1052         result = acpi_thermal_set_polling(tz, seconds);
1053         if (result)
1054                 return result;
1055
1056         acpi_thermal_check(tz);
1057
1058         return count;
1059 }
1060
1061 static int acpi_thermal_add_fs(struct acpi_device *device)
1062 {
1063         struct proc_dir_entry *entry = NULL;
1064
1065
1066         if (!acpi_device_dir(device)) {
1067                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1068                                                      acpi_thermal_dir);
1069                 if (!acpi_device_dir(device))
1070                         return -ENODEV;
1071                 acpi_device_dir(device)->owner = THIS_MODULE;
1072         }
1073
1074         /* 'state' [R] */
1075         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1076                                   S_IRUGO, acpi_device_dir(device));
1077         if (!entry)
1078                 return -ENODEV;
1079         else {
1080                 entry->proc_fops = &acpi_thermal_state_fops;
1081                 entry->data = acpi_driver_data(device);
1082                 entry->owner = THIS_MODULE;
1083         }
1084
1085         /* 'temperature' [R] */
1086         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1087                                   S_IRUGO, acpi_device_dir(device));
1088         if (!entry)
1089                 return -ENODEV;
1090         else {
1091                 entry->proc_fops = &acpi_thermal_temp_fops;
1092                 entry->data = acpi_driver_data(device);
1093                 entry->owner = THIS_MODULE;
1094         }
1095
1096         /* 'trip_points' [R] */
1097         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1098                                   S_IRUGO,
1099                                   acpi_device_dir(device));
1100         if (!entry)
1101                 return -ENODEV;
1102         else {
1103                 entry->proc_fops = &acpi_thermal_trip_fops;
1104                 entry->data = acpi_driver_data(device);
1105                 entry->owner = THIS_MODULE;
1106         }
1107
1108         /* 'cooling_mode' [R/W] */
1109         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1110                                   S_IFREG | S_IRUGO | S_IWUSR,
1111                                   acpi_device_dir(device));
1112         if (!entry)
1113                 return -ENODEV;
1114         else {
1115                 entry->proc_fops = &acpi_thermal_cooling_fops;
1116                 entry->data = acpi_driver_data(device);
1117                 entry->owner = THIS_MODULE;
1118         }
1119
1120         /* 'polling_frequency' [R/W] */
1121         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1122                                   S_IFREG | S_IRUGO | S_IWUSR,
1123                                   acpi_device_dir(device));
1124         if (!entry)
1125                 return -ENODEV;
1126         else {
1127                 entry->proc_fops = &acpi_thermal_polling_fops;
1128                 entry->data = acpi_driver_data(device);
1129                 entry->owner = THIS_MODULE;
1130         }
1131
1132         return 0;
1133 }
1134
1135 static int acpi_thermal_remove_fs(struct acpi_device *device)
1136 {
1137
1138         if (acpi_device_dir(device)) {
1139                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1140                                   acpi_device_dir(device));
1141                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1142                                   acpi_device_dir(device));
1143                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1144                                   acpi_device_dir(device));
1145                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1146                                   acpi_device_dir(device));
1147                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1148                                   acpi_device_dir(device));
1149                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1150                 acpi_device_dir(device) = NULL;
1151         }
1152
1153         return 0;
1154 }
1155
1156 /* --------------------------------------------------------------------------
1157                                  Driver Interface
1158    -------------------------------------------------------------------------- */
1159
1160 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1161 {
1162         struct acpi_thermal *tz = data;
1163         struct acpi_device *device = NULL;
1164
1165
1166         if (!tz)
1167                 return;
1168
1169         device = tz->device;
1170
1171         switch (event) {
1172         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1173                 acpi_thermal_check(tz);
1174                 break;
1175         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1176                 acpi_thermal_get_trip_points(tz);
1177                 acpi_thermal_check(tz);
1178                 acpi_bus_generate_proc_event(device, event, 0);
1179                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1180                                                   device->dev.bus_id, event, 0);
1181                 break;
1182         case ACPI_THERMAL_NOTIFY_DEVICES:
1183                 if (tz->flags.devices)
1184                         acpi_thermal_get_devices(tz);
1185                 acpi_bus_generate_proc_event(device, event, 0);
1186                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1187                                                   device->dev.bus_id, event, 0);
1188                 break;
1189         default:
1190                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1191                                   "Unsupported event [0x%x]\n", event));
1192                 break;
1193         }
1194
1195         return;
1196 }
1197
1198 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1199 {
1200         int result = 0;
1201
1202
1203         if (!tz)
1204                 return -EINVAL;
1205
1206         /* Get temperature [_TMP] (required) */
1207         result = acpi_thermal_get_temperature(tz);
1208         if (result)
1209                 return result;
1210
1211         /* Get trip points [_CRT, _PSV, etc.] (required) */
1212         result = acpi_thermal_get_trip_points(tz);
1213         if (result)
1214                 return result;
1215
1216         /* Set the cooling mode [_SCP] to active cooling (default) */
1217         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1218         if (!result)
1219                 tz->flags.cooling_mode = 1;
1220
1221         /* Get default polling frequency [_TZP] (optional) */
1222         if (tzp)
1223                 tz->polling_frequency = tzp;
1224         else
1225                 acpi_thermal_get_polling_frequency(tz);
1226
1227         /* Get devices in this thermal zone [_TZD] (optional) */
1228         result = acpi_thermal_get_devices(tz);
1229         if (!result)
1230                 tz->flags.devices = 1;
1231
1232         return 0;
1233 }
1234
1235 static int acpi_thermal_add(struct acpi_device *device)
1236 {
1237         int result = 0;
1238         acpi_status status = AE_OK;
1239         struct acpi_thermal *tz = NULL;
1240
1241
1242         if (!device)
1243                 return -EINVAL;
1244
1245         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1246         if (!tz)
1247                 return -ENOMEM;
1248
1249         tz->device = device;
1250         strcpy(tz->name, device->pnp.bus_id);
1251         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1252         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1253         acpi_driver_data(device) = tz;
1254
1255         result = acpi_thermal_get_info(tz);
1256         if (result)
1257                 goto end;
1258
1259         result = acpi_thermal_add_fs(device);
1260         if (result)
1261                 goto end;
1262
1263         init_timer(&tz->timer);
1264
1265         acpi_thermal_check(tz);
1266
1267         status = acpi_install_notify_handler(device->handle,
1268                                              ACPI_DEVICE_NOTIFY,
1269                                              acpi_thermal_notify, tz);
1270         if (ACPI_FAILURE(status)) {
1271                 result = -ENODEV;
1272                 goto end;
1273         }
1274
1275         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1276                acpi_device_name(device), acpi_device_bid(device),
1277                KELVIN_TO_CELSIUS(tz->temperature));
1278
1279       end:
1280         if (result) {
1281                 acpi_thermal_remove_fs(device);
1282                 kfree(tz);
1283         }
1284
1285         return result;
1286 }
1287
1288 static int acpi_thermal_remove(struct acpi_device *device, int type)
1289 {
1290         acpi_status status = AE_OK;
1291         struct acpi_thermal *tz = NULL;
1292
1293
1294         if (!device || !acpi_driver_data(device))
1295                 return -EINVAL;
1296
1297         tz = acpi_driver_data(device);
1298
1299         /* avoid timer adding new defer task */
1300         tz->zombie = 1;
1301         /* wait for running timer (on other CPUs) finish */
1302         del_timer_sync(&(tz->timer));
1303         /* synchronize deferred task */
1304         acpi_os_wait_events_complete(NULL);
1305         /* deferred task may reinsert timer */
1306         del_timer_sync(&(tz->timer));
1307
1308         status = acpi_remove_notify_handler(device->handle,
1309                                             ACPI_DEVICE_NOTIFY,
1310                                             acpi_thermal_notify);
1311
1312         /* Terminate policy */
1313         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1314                 tz->trips.passive.flags.enabled = 0;
1315                 acpi_thermal_passive(tz);
1316         }
1317         if (tz->trips.active[0].flags.valid
1318             && tz->trips.active[0].flags.enabled) {
1319                 tz->trips.active[0].flags.enabled = 0;
1320                 acpi_thermal_active(tz);
1321         }
1322
1323         acpi_thermal_remove_fs(device);
1324
1325         kfree(tz);
1326         return 0;
1327 }
1328
1329 static int acpi_thermal_resume(struct acpi_device *device)
1330 {
1331         struct acpi_thermal *tz = NULL;
1332         int i, j, power_state, result;
1333
1334
1335         if (!device || !acpi_driver_data(device))
1336                 return -EINVAL;
1337
1338         tz = acpi_driver_data(device);
1339
1340         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1341                 if (!(&tz->trips.active[i]))
1342                         break;
1343                 if (!tz->trips.active[i].flags.valid)
1344                         break;
1345                 tz->trips.active[i].flags.enabled = 1;
1346                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1347                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1348                             handles[j], &power_state);
1349                         if (result || (power_state != ACPI_STATE_D0)) {
1350                                 tz->trips.active[i].flags.enabled = 0;
1351                                 break;
1352                         }
1353                 }
1354                 tz->state.active |= tz->trips.active[i].flags.enabled;
1355         }
1356
1357         acpi_thermal_check(tz);
1358
1359         return AE_OK;
1360 }
1361
1362 #ifdef CONFIG_DMI
1363 static int thermal_act(struct dmi_system_id *d) {
1364
1365         if (act == 0) {
1366                 printk(KERN_NOTICE "ACPI: %s detected: "
1367                         "disabling all active thermal trip points\n", d->ident);
1368                 act = -1;
1369         }
1370         return 0;
1371 }
1372 static int thermal_nocrt(struct dmi_system_id *d) {
1373
1374         printk(KERN_NOTICE "ACPI: %s detected: "
1375                 "disabling all critical thermal trip point actions.\n", d->ident);
1376         nocrt = 1;
1377         return 0;
1378 }
1379 static int thermal_tzp(struct dmi_system_id *d) {
1380
1381         if (tzp == 0) {
1382                 printk(KERN_NOTICE "ACPI: %s detected: "
1383                         "enabling thermal zone polling\n", d->ident);
1384                 tzp = 300;      /* 300 dS = 30 Seconds */
1385         }
1386         return 0;
1387 }
1388 static int thermal_psv(struct dmi_system_id *d) {
1389
1390         if (psv == 0) {
1391                 printk(KERN_NOTICE "ACPI: %s detected: "
1392                         "disabling all passive thermal trip points\n", d->ident);
1393                 psv = -1;
1394         }
1395         return 0;
1396 }
1397
1398 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1399         /*
1400          * Award BIOS on this AOpen makes thermal control almost worthless.
1401          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1402          */
1403         {
1404          .callback = thermal_act,
1405          .ident = "AOpen i915GMm-HFS",
1406          .matches = {
1407                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1408                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1409                 },
1410         },
1411         {
1412          .callback = thermal_psv,
1413          .ident = "AOpen i915GMm-HFS",
1414          .matches = {
1415                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1416                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1417                 },
1418         },
1419         {
1420          .callback = thermal_tzp,
1421          .ident = "AOpen i915GMm-HFS",
1422          .matches = {
1423                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1424                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1425                 },
1426         },
1427         {
1428          .callback = thermal_nocrt,
1429          .ident = "Gigabyte GA-7ZX",
1430          .matches = {
1431                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1432                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1433                 },
1434         },
1435         {}
1436 };
1437 #endif /* CONFIG_DMI */
1438
1439 static int __init acpi_thermal_init(void)
1440 {
1441         int result = 0;
1442
1443         dmi_check_system(thermal_dmi_table);
1444
1445         if (off) {
1446                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1447                 return -ENODEV;
1448         }
1449         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1450         if (!acpi_thermal_dir)
1451                 return -ENODEV;
1452         acpi_thermal_dir->owner = THIS_MODULE;
1453
1454         result = acpi_bus_register_driver(&acpi_thermal_driver);
1455         if (result < 0) {
1456                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1457                 return -ENODEV;
1458         }
1459
1460         return 0;
1461 }
1462
1463 static void __exit acpi_thermal_exit(void)
1464 {
1465
1466         acpi_bus_unregister_driver(&acpi_thermal_driver);
1467
1468         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1469
1470         return;
1471 }
1472
1473 module_init(acpi_thermal_init);
1474 module_exit(acpi_thermal_exit);